I haven't noticed a mental change when entering a DC but the physical change is there. I can't quite describe what it feels like to lose one's penis for a vagina but it's worth trying since it comes back whenever you like .

Yes I have failed on more than one occasion and I'd have to chalk the failures up with lack of expectation or low lucidity. EXPECTATION is a huge factor in most LD experiments, if you think you will fail you probably will. Sometimes failure is just the way it goes without any reason I can think of.... Best of luck guys it's fun times!